diff -ru a/icu4c/source/common/udata.cpp b/icu4c/source/common/udata.cpp
--- a/icu4c/source/common/udata.cpp	2019-04-17 12:03:04.000000000 +0000
+++ b/icu4c/source/common/udata.cpp	2020-07-14 23:49:37.836668741 +0000
@@ -18,11 +18,10 @@
 
 #include "unicode/utypes.h"  /* U_PLATFORM etc. */
 
-#ifdef __GNUC__
-/* if gcc
-#define ATTRIBUTE_WEAK __attribute__ ((weak))
-might have to #include some other header
-*/
+#if defined(__GNUC__) || defined(__SUNPRO_CC)
+#  define ATTRIBUTE_WEAK __attribute__ ((weak))
+#else
+#  define ATTRIBUTE_WEAK
 #endif
 
 #include "unicode/putil.h"
@@ -649,10 +648,9 @@
  * partial-data-library access functions where each returns a pointer
  * to its data package, if it is linked in.
  */
-/*
-extern const void *uprv_getICUData_collation(void) ATTRIBUTE_WEAK;
-extern const void *uprv_getICUData_conversion(void) ATTRIBUTE_WEAK;
-*/
+U_CDECL_BEGIN
+const void *uprv_getICUData_conversion(void) ATTRIBUTE_WEAK;
+U_CDECL_END
 
 /*----------------------------------------------------------------------*
  *                                                                      *
@@ -710,10 +708,11 @@
         if (uprv_getICUData_collation) {
             setCommonICUDataPointer(uprv_getICUData_collation(), FALSE, pErrorCode);
         }
+        */
         if (uprv_getICUData_conversion) {
             setCommonICUDataPointer(uprv_getICUData_conversion(), FALSE, pErrorCode);
         }
-        */
+
 #if !defined(ICU_DATA_DIR_WINDOWS)
 // When using the Windows system data, we expect only a single data file.
         setCommonICUDataPointer(&U_ICUDATA_ENTRY_POINT, FALSE, pErrorCode);
         {
diff -ru a/icu4c/source/common/unicode/uconfig.h b/icu4c/source/common/unicode/uconfig.h
--- a/icu4c/source/common/unicode/uconfig.h	2019-04-17 12:03:04.000000000 +0000
+++ b/icu4c/source/common/unicode/uconfig.h	2020-07-14 23:49:37.836668741 +0000
@@ -55,6 +55,11 @@
 #include "uconfig_local.h"
 #endif
 
+// Tensorflow is statically linked on all platforms.
+#ifndef U_STATIC_IMPLEMENTATION
+#define U_STATIC_IMPLEMENTATION
+#endif
+
 /**
  * \def U_DEBUG
  * Determines whether to include debugging code.
